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Subject :NSO    Class : Class 9

A person exerts a horizontal force of 500 N on a box, which also experiences a frictional force of 100 N.

How much work is done against friction when the box moves a horizontal distance of 3 m?

(A) 300 J

(B) 1200 J

(C) 1500 J

(D) 1800 J

(500-400) multiply by 3=1200

Ans 1: (Master Answer)

Class : Class 1
The correct answer is A.

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